add base io interface

include/examples/PacketExample.h

@@ -6,12 +6,13 @@ enum PacketId {
 	UpgradeTower,
 };
 
-#include <examples/KeepAlivePacket.h>
 #include <examples/DisconnectPacket.h>
+#include <examples/KeepAlivePacket.h>
 #include <examples/UpgradeTowerPacket.h>
 
 // they must be in the same order as in the enum !
 using AllPackets = std::tuple<KeepAlivePacket, DisconnectPacket, UpgradeTowerPacket>;
 
-#include <sp/default/DefaultPacketHandler.h>
+#include <sp/default/DefaultPacketDispatcher.h>
 #include <sp/default/DefaultPacketFactory.h>
+#include <sp/default/DefaultPacketHandler.h>

include/sp/io/IOInterface.h

@@ -0,0 +1,98 @@
+#pragma once
+
+#include <memory>
+#include <sp/common/DataBuffer.h>
+
+namespace sp {
+
+template <typename IOTag>
+class IOInterface {
+  public:
+	DataBuffer Read(std::size_t a_Amount);
+	void Write(const DataBuffer& a_Data);
+};
+
+template <typename IOTag, typename MessageDispatcher, typename MessageFactory>
+class IOStream {
+  protected:
+	MessageDispatcher m_Dispatcher;
+	IOInterface<IOTag> m_Interface;
+
+	using MessageBase = typename MessageDispatcher::MessageBaseType;
+	using MsgIdType = typename MessageBase::MsgIdType;
+
+  public:
+	IOStream() {}
+	IOStream(IOInterface<IOTag>&& a_Interface) : m_Interface(std::move(a_Interface)) {}
+	IOStream(IOStream&& a_Stream) : m_Dispatcher(std::move(a_Stream.m_Dispatcher)), m_Interface(std::move(a_Stream.m_Interface)) {}
+
+	void RecieveMessages();
+	void SendMessage(const MessageBase& a_Message);
+
+	MessageDispatcher& GetDispatcher() {
+		return m_Dispatcher;
+	}
+};
+
+template <typename IOTag, typename MessageDispatcher, typename MessageFactory>
+void IOStream<IOTag, MessageDispatcher, MessageFactory>::SendMessage(const MessageBase& a_Message) {
+	// TODO: process compress + encryption
+	DataBuffer data = a_Message.Write();
+	DataBuffer dataSize;
+	m_Interface.Write(dataSize << sp::VarInt{data.GetSize()} << data);
+}
+
+template <typename IOTag, typename MessageDispatcher, typename MessageFactory>
+void IOStream<IOTag, MessageDispatcher, MessageFactory>::RecieveMessages() {
+	// TODO: process compress + encryption
+	while (true) {
+
+		// reading the first VarInt part byte by byte
+		std::uint64_t lenghtValue = 0;
+		unsigned int readPos = 0;
+
+		while (true) {
+			static constexpr int SEGMENT_BITS = (1 << 7) - 1;
+			static constexpr int CONTINUE_BIT = 1 << 7;
+
+			DataBuffer buffer = m_Interface.Read(sizeof(std::uint8_t));
+
+			// if non-blocking call
+			if (buffer.GetSize() == 0)
+				return;
+
+			std::uint8_t part;
+			buffer >> part;
+			lenghtValue |= static_cast<std::uint64_t>(part & SEGMENT_BITS) << readPos;
+
+			if ((part & CONTINUE_BIT) == 0)
+				break;
+
+			readPos += 7;
+
+			if (readPos >= 8 * sizeof(lenghtValue))
+				throw std::runtime_error("VarInt is too big");
+		}
+
+
+		DataBuffer buffer;
+		buffer = m_Interface.Read(lenghtValue);
+
+		// TODO: process compress + encryption
+
+		MsgIdType packetType;
+		buffer >> packetType;
+
+		static const MessageFactory messageFactory;
+
+		std::unique_ptr<MessageBase> message = messageFactory.CreateMessage(packetType);
+
+		assert(message != nullptr);
+
+		message->Read(buffer);
+
+		GetDispatcher().Dispatch(*message);
+	}
+}
+
+}  // namespace sp

include/sp/io/IOInterfaceImpl.inl

@@ -0,0 +1 @@
+#pragma once

include/sp/protocol/MessageDispatcher.h

@@ -6,6 +6,7 @@
  */
 
 #include <map>
+#include <memory>
 
 namespace sp {
 
@@ -19,6 +20,8 @@ class MessageDispatcher {
 	std::map<MessageIdType, std::vector<std::shared_ptr<MessageHandler>>> m_Handlers;
 
   public:
+	using MessageBaseType = MessageBase;
+
 	/**
 	 * \brief Constructor
 	 */
@@ -51,4 +54,4 @@ class MessageDispatcher {
 
 #include <sp/protocol/message/MessageDispatcherImpl.inl>
 
-}  // namespace blitz
+}  // namespace sp

include/sp/protocol/MessageFactory.h

@@ -16,7 +16,7 @@ class MessageFactory {
 
 	MessageFactory() : m_Factory(details::ArrayFiller<TBase, TTMessages>::ArrayCreate()) {}
 
-	std::unique_ptr<TBase> CreateMessage(IdType id) {
+	std::unique_ptr<TBase> CreateMessage(IdType id) const {
 		if (id >= m_Factory.size())
 			return nullptr;
 		return m_Factory.at(id)();

include/sp/protocol/message/MessageInterfacesImpl.h

@@ -75,6 +75,13 @@ class MessageInterfaceWriteBase : public TBase {
 		WriteImpl(buffer);
 	}
 
+	// helper
+	DataBuffer Write() const {
+		DataBuffer buffer;
+		this->Write(buffer);
+		return buffer;
+	}
+
   protected:
 	virtual void WriteImpl(DataBuffer& buffer) const = 0;
 };
@@ -113,6 +120,13 @@ class MessageInterfaceWriteIdBase : public TBase {
 		this->WriteData(this->GetId(), buffer);
 		this->WriteImpl(buffer);
 	}
+
+	// helper
+	DataBuffer Write() const {
+		DataBuffer buffer;
+		this->Write(buffer);
+		return buffer;
+	}
 };
 
 }  // namespace details

test/test_io.cpp

@@ -0,0 +1,62 @@
+#include <iostream>
+
+#include <examples/PacketExample.h>
+#include <sp/io/IOInterface.h>
+
+struct DBTag {};
+
+template <>
+class sp::IOInterface<DBTag> {
+  private:
+	sp::DataBuffer m_VirtualIO;
+
+  public:
+	sp::DataBuffer Read(std::size_t a_Amount) {
+		// since we are just testing it, we ignore reads that overflows
+		if (m_VirtualIO.GetReadOffset() + a_Amount > m_VirtualIO.GetSize())
+			return {};
+
+		DataBuffer data;
+		m_VirtualIO.ReadSome(data, a_Amount);
+		return data;
+	}
+	void Write(const sp::DataBuffer& a_Data) {
+		m_VirtualIO << a_Data;
+	}
+};
+
+using DataBufferStream = sp::IOStream<DBTag, sp::PacketDispatcher, sp::PacketFactory>;
+
+class CustomPacketHandler : public sp::PacketHandler {
+	void Handle(const KeepAlivePacket& packet) {
+		std::cout << "KeepAlive handled ! " << packet.GetKeepAliveId() << "\n";
+	}
+
+	void Handle(const DisconnectPacket& packet) {
+		std::cout << "Disconnect handled ! " << packet.GetReason() << "\n";
+	}
+
+	void Handle(const UpgradeTowerPacket& packet) {
+		std::cout << "UpgradeTower handled !\n";
+	}
+};
+
+int main() {
+	auto handler = std::make_shared<CustomPacketHandler>();
+
+	DataBufferStream stream;
+	stream.GetDispatcher().RegisterHandler(PacketId::Disconnect, handler);
+
+	// this should not be dispatched
+	stream.SendMessage(KeepAlivePacket{96});
+	stream.RecieveMessages();
+
+	stream.GetDispatcher().RegisterHandler(PacketId::KeepAlive, handler);
+
+	stream.SendMessage(KeepAlivePacket{69});
+	stream.RecieveMessages();  // here, it's non-blocking
+	stream.SendMessage(DisconnectPacket{"I don't know"});
+	stream.RecieveMessages();  // here, it's non-blocking
+
+	return 0;
+}

test/test_packets.cpp

@@ -3,8 +3,8 @@
 #include <examples/PacketExample.h>
 #include <memory>
 
-#include <sp/extensions/Extensions.h>
 #include <sp/default/DefaultPacketDispatcher.h>
+#include <sp/extensions/Extensions.h>
 
 class KeepAliveHandler : public sp::PacketHandler {
 	void Handle(const KeepAlivePacket& packet) {
@@ -28,8 +28,7 @@ int main() {
 	auto handler = std::make_shared<KeepAliveHandler>();
 	msg->Dispatch(*handler);
 
-	sp::DataBuffer buffer;
+	sp::DataBuffer buffer = msg->Write();
-	msg->Write(buffer);
 
 	std::uint8_t msgId;
 	buffer >> msgId;